/Engine/Source/Editor/BlueprintGraph/Classes/K2Node.h
Helper function to restore Split Pins after ReallocatePinsDuringReconstruction, call after recreating all pins to restore split pin state.
void RestoreSplitPins ( [TArray](API\Runtime\Core\Containers\TArray)< [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * > & OldPins )